Those pictures are taken at the top of Great Scott.
I am not sure I would call it a true cornice. The good skiers jump right in and take the steepest stuff at the top, while "sports" like me, tend to slide across the top, missing the top 20 ft of vertical, so if you fall, you don't end up in a big slide down the steep part of the hill. Next door is Silver Fox which is actually a steeper pitch down the mountain, likely one of the steepest named trail map runs on the mountain. The trails marked Upper Cirque are a series of very steep and narrow chutes, one called Elevator. Another very steep area is the Wilbere Bowl or Chute(not sure which is which), but you loose quite a bit of vertical to get there.
Another doosey is right under the Mineral Basin Express, High Stakes, if you dare.
Then there are a couple of dozen double black gates. Does anyone know how many? what is so cool about snowbird is these steep nooks and crannies are spread over the entire mountain. gravity is very easy to find at the Bird.
those pictures were taken last week of Feb which I think is the best time to go. The sun is not yet high enough to cause real havoc, but it is just just starting to creep up high enough to start the freeze thaw cycle, but it'll be another week or two before it ruins things. At Alta though, last week of Feb, you can see the sun ruining the snow more, because it doesn't as much face north.